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Capability of evolutionary cryptosystems against differential cryptanalysis

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Science China(Information Sciences) 2011年第10期54卷 1991-2000页

作者： ZHANG HuanGuo 1,2 ,LI ChunLei 1,2 & TANG Ming 1,2 1 School of Computer,Wuhan University,Wuhan 430072,China 2 Key Laboratory of Aerospace Information Security and Trusted Computing of Ministry of Education,Wuhan University,Wuhan 430072,China 1. School of Computer Wuhan University Wuhan 430072 China2. Key Laboratory of Aerospace Information Security and Trusted Computing of Ministry of Education Wuhan University Wuhan 430072 China

The evolutionary cryptosystem is a new *** paper studies its security level resisting against differential *** is shown that the evolutionary cryptosystem possesses higher resistance than its initial fixed cryptosystem against differential *** the basis of the relationship among the data complexity,the bit advantage and the success rate of differential cryptanalysis,it is proven that more data is needed for attacking the evolutionary cryptosystem when the bit advantage and success rate are ***,it is shown that the time complexity for attacking the evolutionary cryptosystem is higher than that of differential attacking its initial fixed cryptosystem with the same amount of plaintext-ciphertext *** research indicates that the evolutionary cryptosystem is more robust than its initial fixed cryptosystem against differential cryptanalysis.

关键词： information security cryptology evolutionary cryptosystem cryptanalysis differential cryptanalysis

An Analysis of International Data Encryption Algorithm(IDEA) Security against differential cryptanalysis

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Wuhan University Journal of Natural Sciences 2008年第6期13卷 697-701页

作者： CHEN Jia XUE Dongyue LAI Xuejia School of Electronic Inforamation and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China

The security of international date encryption algorithm （IDEA（16））, a mini IDEA cipher, against differential cryptanalysis is investigated. The results show that [DEA（16） is secure against differential cryptanalysis attack after 5 rounds while IDEA（8） needs 7 rounds for the same level of security. The transition matrix for IDEA（16） and its eigenvalue of second largest magnitude are computed. The storage method for the transition matrix has been optimized to speed up file I/O. The emphasis of the work lies in finding out an effective way of computing the eigenvalue of the matrix. To lower time complexity, three mature algorithms in finding eigenvalues are compared from one another and subspace iteration algorithm is employed to compute the eigenvalue of second largest module, with a precision of 0.001.

关键词： international date encryption algorithm(IDEA) cipher differential cryptanalysis Markov cipher transition matrix subspace iteration

A Further Understanding of differential-Linear cryptanalysis

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Chinese Journal of Electronics 2020年第4期29卷 660-666页

作者： REN Jiongjiong CHEN Shaozhen State Key Laboratory of Mathematical Engineering and Advanced Computing State Key Laboratory of Cryptology

differential-linear cryptanalysis has attracted much attention since proposed to attack DES in 1994, and then some generalized theories are developed to complement and unify the ***, the links between differential-linear cryptanalysis and other important cryptanalysis methods have been still *** motivation is to fix the *** establishing some boolean equations, we propose the mathematical links among differential, linear and differential-linear *** then generalise the definition of capacity and present some properties of the capacity of differential *** links and properties are employed to explore the relationships between multidimensional differential-linear hulls and integral *** show that a multidimensional differential-linear hull of certain correlation always implies the existence of an integral distinguisher and a zero-correlation linear hull, while a special integral distinguisher indicates the existence of a multidimensional differential-linear hull.

关键词： Block cipher differential cryptanalysis Linear cryptanalysis differential-linear cryptanalysis Integral distinguisher Zero-correlation

Quantum key recovery attack on SIMON32/64

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Cybersecurity 2021年第1期4卷 349-363页

作者： Hui Liu Li Yang State Key Laboratory of Information Security Institute of Information EngineeringChinese Academy of Sciences100093 BeijingChina School of Cyber Security University of Chinese Academy of Sciences100049 BeijingChina

The quantum security of lightweight block ciphers is receiving more and more ***,the existing quantum attacks on lightweight block ciphers only focused on the quantum exhaustive search,while the quantum attacks combined with classical cryptanalysis methods haven’t been well *** this paper,we study quantum key recovery attack on SIMON32/64 using Quantum Amplitude Amplification algorithm in Q1 *** first,we reanalyze the quantum circuit complexity of quantum exhaustive search on SIMON32/*** estimate the Clifford gates count more accurately and reduce the T gate ***,the T-depth and full depth is reduced due to our minor ***,using four differentials given by Biryukov in FSE 2014 as our distinguisher,we give our quantum key recovery attack on 19-round SIMON32/*** treat the two phases of key recovery attack as two QAA instances separately,and the first QAA instance consists of four sub-QAA ***,we design the quantum circuit of these two QAA instances and estimate their corresponding quantum circuit *** conclude that the quantum circuit of our quantum key recovery attack is lower than quantum exhaustive *** work firstly studies the quantum dedicated attack on SIMON32/*** this is the first work to study the complexity of quantum dedicated attacks from the perspective of quantum circuit complexity,which is a more fine-grained analysis of quantum dedicated attacks’complexity.

关键词： Quantum cryptanalysis Lightweight block ciphers Quantum amplitude amplification differential cryptanalysis Key recovery attack SIMON32/64

A Novel Approach for Security Enhancement of Data Encryption Standard

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Computers, Materials & Continua 2023年第6期75卷 5073-5086页

作者： Dawood Shah Tariq Shah Sajjad Shaukat Jamal Mohammad Mazyad Hazzazi Amer Aljaedi Adel R.Alharbi Department of Mathematics Quaid-i-Azam UniversityIslamabadPakistan Department of Mathematics College of ScienceKing Khalid UniversityAbhaSaudi Arabia College of Computing and Information Technology University of TabukTabuk71491Saudi Arabia

Data Encryption Standard(DES)is a symmetric key cryptosystem that is applied in different cryptosystems of recent ***,researchers found defects in the main assembling of the DES and declared it insecure against linear and differential *** this paper,we have studied the faults and made improvements in their internal structure and get the new algorithm for Improved *** improvement is being made in the substitution step,which is the only nonlinear component of the *** alteration provided us with great outcomes and increase the strength of ***,a novel 6×6 good quality S-box construction scheme has been hired in the substitution phase of the *** construction involves the Galois field method and generates robust S-boxes that are used to secure the scheme against linear and differential *** again,the key space of the improved DES has been enhanced against the brute force *** out-comes of different performance analyses depict the strength of our proposed substitution boxes which also guarantees the strength of the overall DES.

关键词： DES S-box linear cryptanalysis differential cryptanalysis

New Collision Paths for Round-Reduced SKINNY-Hash

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China Communications 2020年第6期17卷 145-152页

作者： Xinfang Song Wei Jiang Zheng Li Lijing Liu Shenggen Wu Beijing Information Technology College Beijing100015China Chinese Academy of Cyberspace Studies Beijing100010China Faculty of Information Technology Beijing University of TechnologyBeijing100024China Beijing Key Laboratory of Trusted Computing Beijing100124China

In recent years,with the rapid development of the Internet of Things(IoT),RFID tags,industrial controllers,sensor nodes,smart cards and other small computing devices are increasingly widely *** order to help protect low-power,low-cost Internet of things devices,lightweight cryptography came into *** order to launch the standard of cryptographic algorithm suitable for constrained environment,NIST started the process of lightweight cryptography standardization in 2016,and published the second round of candidate cryptographic algorithms in ***-Hash in the sponge construction is one of the second round candidates,as well as *** tweakable block cipher SKINNY is the basic component for both of *** cryptanalysts have proposed several cryptanalysis results on SKINNY and SKINNY-AEAD,there is no cryptanalysis results on *** on the differential cryptanalysis and the method of mixed integer programming(MELP),we perform differential cryptanalysis on *** core is to set up the inequations of the MILP ***,it is hard to obtain the inequations of the substitution(i.e.S-box)obeying the previous *** a careful study of the permutation,we partition the substitution into a nonlinear part and a linear part,then a series of inequations in the MILP model is obtained to describe the differentials with high *** a result,we propose a differential hash collision path of 3-round *** adjusting the bit rate of SKINNY-tk3-Hash,we propose a 7-round collision path for the simplified *** cryptanalysis in this paper will help to promote the NIST Lightweight Crypto Standardization process.

关键词： Internet of Things SKINNY-Hash differential cryptanalysis collision path MILP

differential Attack on Five Rounds of the SC2000 Block Cipher

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Journal of Computer Science & Technology 2011年第4期26卷 722-731页

作者：吕继强 Department of Computer Science Ecole Normale Superieure45 Rue d'Ulm

The SC2000 block cipher has a 128-bit block size and a user key of 128, 192 or 256 bits, which employs a total of 6.5 rounds if a 128-bit user key is used. It is a CRYPTREC recommended e-government cipher in Japan. In this paper we address how to recover the user key from a few subkey bits of SC2000, and describe two 4.75-round differential characteristics with probability 2-126 of SC2000 and seventy-six 4.75-round differential characteristics with probability 2-127. Finally, we present a differential cryptanalysis attack on a 5-round reduced version of SC2000 when used with a 128-bit key; the attack requires 21256s chosen plaintexts and has a time complexity of 212575 5-round SC2000 encryptions. The attack does not threat the security of the full SC2000 cipher, but it suggests for the first time that the safety margin of SC2000 with a 128-bit key decreases below one and a half rounds.

关键词： cryptology block cipher SC2000 differential cryptanalysis

A new perturbation algorithm and enhancing security of SFLASH signature scheme

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Science China(Information Sciences) 2010年第4期53卷 760-768页

作者： WANG HouZhen1,2, ZHANG HuanGuo1,2*, GUAN HaiMing3 & HAN HaiQing1,2 1The Key Laboratory of Aerospace Information Security and Trusted Computing, Ministry of Education, Wuhan University, Wuhan 430072, China 2School of Computer, Wuhan University, Wuhan 430079, China 3Chinese Electronic Equipment System Corporation, Beijing 100039, China 1. The Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of Education Wuhan University Wuhan 430072 China2. School of Computer Wuhan University Wuhan 430079 China3. Chinese Electronic Equipment System Corporation Beijing 100039 China

This paper introduces the concept of noise factor and noise operation, and constructs a noise group. We present a new perturbation algorithm for enhancing security of multivariate public key cryptosystems (MPKCs). European Consortium SFLASH which derives from Matsumoto-Imai scheme is a fast signature scheme intended for low cost smart cards. It was broken with the differential cryptanalysis by Dubois et al. in 2007. Taking Matsumoto-Imai system as an example, security analysis shows that the new algorithm can powerfully demolish its potential mathematical properties of the public key, and effectively avoid differential cryptanalysis without lowering the effciency of the original algorithm.

关键词： SFLASH differential cryptanalysis noise factor noise operation noise group

Improved deep learning aided key recovery framework:applications to large-state block ciphers

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Frontiers of Information Technology & Electronic Engineering 2024年第10期25卷 1406-1420页

作者： Xiaowei LI Jiongjiong REN Shaozhen CHEN School of Cyber Science and Technology Information Engineering UniversityZhengzhou 450000China

At the Annual International Cryptology Conference in 2019,Gohr introduced a deep learning based cryptanalysis technique applicable to the reduced-round lightweight block ciphers with a short block of SPECK32/*** significant challenge left unstudied by Gohr's work is the implementation of key recovery attacks on large-state block ciphers based on deep *** purpose of this paper is to present an improved deep learning based framework for recovering keys for large-state block ***,we propose a key bit sensitivity test(KBST)based on deep learning to divide the key space ***,we propose a new method for constructing neural distinguisher combinations to improve a deep learning based key recovery framework for large-state block ciphers and demonstrate its rationality and effectiveness from the perspective of *** the improved key recovery framework,we train an efficient neural distinguisher combination for each large-state member of SIMON and SPECK and finally carry out a practical key recovery attack on the large-state members of SIMON and ***,we propose that the 13-round SIMON64 attack is the most effective approach for practical key recovery to ***,this is the first attempt to propose deep learning based practical key recovery attacks on18-round SIMON128,19-round SIMON128,14-round SIMON96,and 14-round ***,we enhance the outcomes of the practical key recovery attack on SPECK large-state members,which amplifies the success rate of the key recovery attack in comparison to existing results.

关键词： Deep learning Large-state block cipher Key recovery differential cryptanalysis SIMON SPECK